Hey Twins7221,
Thank you for using the Apple Support Communities! We see you're experiencing an issue with a Wi-Fi network disconnecting during FaceTime calls.
This article may help: If you can't make or receive a FaceTime call on your iPhone or iPad. Specifically go through the steps in the section labeled "If you still need help".
1. Make sure that your device has a Wi-Fi connection to the internet or a cellular-data connection.
Learn more if you're using router, firewall, or security software that restricts internet access.
2. If you're trying to use FaceTime over cellular, make sure that Use Cellular Data is on for FaceTime. Go to Settings and tap Cellular or tap Mobile Data, then turn on FaceTime. If you're using an iPad, you might see Settings > Cellular Data.
3. Go to Settings > FaceTime and make sure that FaceTime is on.
If you see "Waiting for Activation," turn FaceTime off and then on again. Learn what to do if you can't activate FaceTime.
If you don't see the FaceTime setting, make sure that Camera and FaceTime aren't off in Settings > Screen Time > Content & Privacy Restrictions > Allowed Apps.
Make sure that you have the correct phone number or email address listed.
4. Go to Settings > General > Date & Time and turn on Set Automatically.
5. Restart your device.
6. Update your device to the latest version of iOS or iPadOS.
To help with isolating the issue, try using FaceTime with a different Wi-Fi network and/or cellular data. If it works with either a different Wi-Fi network or with cellular data, but still disconnects with that one Wi-Fi network, the issue is with it. Reach out to the provider of that Wi-Fi network for further assistance.
Take care.